Fixed some test case for BUG#32205

mysql-test/r/binlog_start_comment.result:
  update result
mysql-test/r/mysqlbinlog2.result:
  Update result for BUG#32205
mysql-test/t/binlog_start_comment.test:
  Reset master at the start of test, use a file instead of a pipe, do clean up

mysql-test/r/binlog_start_comment.result

+reset master;
 drop table if exists t1,t2;
 create table t1 (word varchar(20)) -- create table t1;
 create table t2 (word varchar(20)) -- create table t2;

mysql-test/t/binlog_start_comment.test

@@ -2,6 +2,7 @@
 # with a syntax error, replicates fine
 
 -- source include/have_log_bin.inc
+reset master;
 --disable_warnings
 drop table if exists t1,t2;
 --enable_warnings
@@ -11,6 +12,11 @@ load data infile '../std_data_ln/words.dat' into table t1 -- load data to t1;
 insert into t2 values ("Ada");
 flush logs;
 select * from t2;
---exec $MYSQL_BINLOG $MYSQLTEST_VARDIR/log/master-bin.000001 | $MYSQL
+--exec $MYSQL_BINLOG $MYSQLTEST_VARDIR/log/master-bin.000001 > $MYSQLTEST_VARDIR/tmp/binlog_start_comment.binlog
+--exec $MYSQL < $MYSQLTEST_VARDIR/tmp/binlog_start_comment.binlog
 flush logs;
 select * from t2;
+
+# clean up
+drop table t1,t2;
+--system rm $MYSQLTEST_VARDIR/tmp/binlog_start_comment.binlog